Radiotracer Studies of the Chlorofluorination of Sulphur Tetrafluoride at Mercury(II) Fluoride

Selougha, Mohamed (1990) Radiotracer Studies of the Chlorofluorination of Sulphur Tetrafluoride at Mercury(II) Fluoride. MSc(R) thesis, University of Glasgow.

Abstract

The room temperature reaction between sulphur tetrafluoride and chlorine monofluoride in the presence of mercury(II) fluoride has been described in this work. Using [35S]-sulphur labelled sulphur tetrafluoride and [36Cl]-chlorine labelled chlorine monofluoride, the catalytic activity of mercury(II) fluoride for the above reaction has been studied. The interaction between the probe molecules sulphur tetrafluoride or chlorine monofluoride with mercury(II) fluoride under heterogenous conditions has been examined using radiochemically labelled species [35S]-sulphur labelled sulphur tetrafluoride and [36Cl]-chlorine labelled chlorine monofluoride. Possible poisoning reactions resulting from the interaction of these probe molecules with mercury(II) fluoride have also been examined by studying the chemisorption and retention of these molecules at mercury(II) fluoride surface. It has been shown that preteatment of mercury(II) fluoride before use as a catalyst affects both its catalytical activity and BET area. However, its pretreatment with hexafluoroacetone in the presence of acetonitrile followed by thermal decomposition of its adduct formed, has been found to be the most effective way to increase the BET area and enhance its catalytic actvity. The pretreatment of mercury(II) fluoride with sulphur tetrafluoride has also been used. However the latter method is less effective. The BET area of mercury(II) fluoride untreated and pretreated has been determined in this work. The radioisotope 85Kr has been used as adsorbate for small BET area determination. However for the large BET area, N2 has been used as adsorbate.

• Item Type: Thesis (MSc(R))
• Qualification Level: Masters
• Keywords: Inorganic chemistry, Physical chemistry
• Date of Award: 1990
• Depositing User: Enlighten Team
• Unique ID: glathesis:1990-78156
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 30 Jan 2020 15:38
• Last Modified: 30 Jan 2020 15:38
• URI: https://theses.gla.ac.uk/id/eprint/78156